The wins will please Creston, which paid £38.3 million to acquire the agency in April last year.
TMW won the estimated £1 million Sainsbury's business following a pitch against the incumbent, Proximity London, Partners Andrews Aldridge and Archibald Ingall Stretton. The review was handled by the Haystack Group and the supermarket's brand director, Helen Buck.
T-Mobile, which has used TMW on its direct marketing account since 2003, appointed digitalTMW after a competitive pitch. The agency is responsible for all of the mobile operator's direct response online advertising.
Currently, TMW is working on the launch and development of T-Mobile's Street Gig microsite, which includes an integrated campaign using MMS, e-mail, SMS and press advertising.
Creston's acquisitive strategy has been reaping dividends. In December, it announced that first-half pre-tax profits had risen by 35 per cent to £4.9 million.
That same month, it bought the healthcare ad agency Pan Advertising for £18.8 million. In 2006, other acquisitions included ICM Research, and in 2005, it bought Delaney Lund Knox Warren & Partners.